In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the __________.

Correct Answer: Option C — bottom of the lube oil sump

Drawing the dirty oil supply line from the lowest point of the lube oil sump ensures that heavy contaminants, sludge, and accumulated water are continuously removed by the centrifuge before they can be recirculated through the diesel engine lubrication system.